<?php namespace App\Services;
/**
 * Created by PhpStorm.
 * User: crady_yang
 * Date: 2017/12/18
 * Time: 下午5:24
 */

class PaymentGateway
{
    protected $tax;

    public function __construct($tax = 'xxx')
    {
        $this->tax = $tax;
    }
}